Is Autonomous Assembler legal in Standard, Modern, and Commander?

Autonomous Assembler is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Autonomous Assembler

Q: What type of card is Autonomous Assembler?

Autonomous Assembler is an Artifact Creature — Assembly-Worker. Its oracle text reads: "Prototype {1}{W} — 2/2 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) Vigilance {1}, {T}: Put a +1/+1 counter on target Assembly-Worker you control. Power/Toughness: 4/5"